A Chrysler 300 can pull a modern-day 16' AS trailer assuming that both vehicles are in excellent operating condition. However, it shouldn't ever be used for that purpose.

A 1/2 ton 4x4 pickup can pull a modern-day 31' AS trailer assuming that both vehicles are in excellent operating condition. You'll have to give me more information regarding trailer weight, tow vehicle weight, payload, tongue weight, how many people are going to be in the truck, how much they weigh, how much luggage and other cargo they are carrying, etc. for me to say with certainty that driving this combo is either a good or a bad idea.

Ok getting back to the topic can a small car tow a trailer? Yes it can if the trailer is made for a small car. I had a 1972 VW bug that pulled a 300lbs pop up Apple bee trailer. Can that same car pull an airstream? No but what you do is buy the trailer 1st and get a tv that will fit the trailer right. As for a jeep to pull it yes I got one for mine but it's the an old woody jeep to pull my a/s with. And if you are wondering I did get my trailer 1st and the tv last. I was looking for what my needs are and for safety too. My trailer is a 58 Overlander 26' that my 90 jeep grand wagoneer will pull it with. I also made sure a tranny cooler was on it and all the stuff for good towing with. The lesson here is safety is the key and what is your needs for the trailer you bought 1st then the tv.

Unit body vehicles are considerably more expensive to design engineer and build than body on frame vehicles.

Unit body vehicles are much stronger than equivalent weight and size body on frame vehicles. On full size cars of old with body on frame construction we used to weld gussets between the frame and body to keep the frame from squishing the body mounts and tearing the trim around the bumper. The strength never came from the frame.